The Iron Railing is a fence you can build (the Iron kit).
In-game description
Steel-blue posts and iron rails, a spike to every bar. Pens animals in; a jump clears it.SHOWN IN THE BUILD RING
Building it
It costs 1 
Iron Ingot, 1 Earth spirit. It needs 3 Jewels first. Take it down with DISMANTLE to get its cost back (see Building).
